Quanzhen Wang1*, Haitao Liu1, Jinhong Du1, Jian Cui2, Guo Chen1 and Yuyan Liu1
1Department of Grassland Science, College of Animal Science and Technology, Northwest Agriculture and Forestry University, 712100 Yangling, Shanxi Province, P. R. China.
2Department of Plant Science, College of Life Science, Northwest Agriculture and Forestry University, 712100, Yangling, Shanxi Province, P. R. China.
